US8602177B2 - Linear motor brake - Google Patents
Linear motor brake Download PDFInfo
- Publication number
- US8602177B2 US8602177B2 US12/376,749 US37674907A US8602177B2 US 8602177 B2 US8602177 B2 US 8602177B2 US 37674907 A US37674907 A US 37674907A US 8602177 B2 US8602177 B2 US 8602177B2
- Authority
- US
- United States
- Prior art keywords
- plate
- mechanical brake
- electrical power
- brake according
- lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/10—Brakes specially adapted for presses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
- F16D63/008—Brakes acting on a linearly moving member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
- H02K7/1021—Magnetically influenced friction brakes
- H02K7/1023—Magnetically influenced friction brakes using electromagnets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/20—Electric or magnetic using electromagnets
- F16D2121/22—Electric or magnetic using electromagnets for releasing a normally applied brake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/58—Mechanical mechanisms transmitting linear movement
- F16D2125/64—Levers
Definitions
- the present invention relates to linear motors and particularly to a brake for arresting movement of the armature in the absence of electrical power.
- Linear motors have many uses but currently attention is being focused on using linear motors as piston and glider type devices to replace hydraulic rams.
- One such use is in the area of testing equipment where it is proposed to mount a linear motor in the form of an electromagnetic ram in an orientation such that the armature of the motor moves in a vertical or substantially vertical direction. In this orientation, it will be appreciated that in the absence of electrical power, the armature is free to move under the effect of gravity. This can cause difficulties especially where the electromagnetic ram is mounted above a test location where a sample to be tested is positioned.
- the present invention has as an object, the provision of a brake which will arrest movement of the armature of an electromagnetic ram substantially immediately power to the ram is lost.
- the brake operates on an extension from the armature.
- the brake preferably comprises a pivotably mounted plate having an aperture for receiving the extension which projects through the aperture and an electrically actuable holding member contacting the plate and arranged to hold the plate in a position where the extension passes through the aperture without contacting the plate while there is electrical power but permits the plate to pivot so that the extension will come into contact with the edge of the aperture should electrical power cease to be present either due to a fault or a switch-off of the aperture.
- FIG. 1 shows a diagrammatic front view of a brake according to the present invention
- FIG. 2 shows a perspective view of the brake shown in FIG. 1 .
- the preferred embodiment of the present invention is a brake which will automatically come into effect should electrical power to an electromagnetic ram be absent and which will utilize the mass of the armature of the ram, acting under gravity, to generate the braking force.
- a rod 10 is attached to the armature of an electromagnetic ram (not shown) so as to act along the axis of the ram or parallel to the axis of the ram. If desired, rotary bearings 11 can be provided to ensure that the rod 10 moves in a truly linear manner.
- a brake is mounted on the frame of a machine incorporating the ram and comprises an elongate plate 17 provided with a hole 19 , the shape and size of which is just larger than the cross-sectional shape and size of the rod 10 .
- the plate 17 is pivotably mounted at one end 20 and is contacted at its other end 21 by a brake inhibiter 23 which is arranged to hold the plate 17 in a position such that the rod 10 passes freely through the hole 19 without contacting the edge of the hole. Preferably this is when the plate 17 is at right angles to the axis or direction of movement of the rod 10 .
- the brake inhibiter 23 is an electrically actuated device such as a solenoid, in this case a rotary solenoid 23 a , which in normal use when electrical power is available, holds the plate 17 in its “off” condition by means of an actuator lever 23 b but when electrical power is not available, exerts little or no force on the plate 17 and thus allows it to pivot under the action of gravity so that the edge of the hole 19 contacts the rod 10 and causes the rod to jam as it tries to drop, also under the action of gravity.
- a solenoid in this case a rotary solenoid 23 a
- the spring 28 limits the braking force to a value which can be readily released simply by activating the rotary solenoid 23 a .
- the free end of the actuator lever 23 b contacts the plate 17 some distance in from the end 21 which results in little force needing to be generated by the rotary solenoid 23 a to hold the brake in this condition.
- the plate 17 moves downwards until it jams against the rod 10 .
- a high force is required and it is preferred to inject a pulse of energy from one or more capacitors into the solenoid to release the brake.
- the brake control arrangement is such that there is a low holding force in normal operation but a high instantaneous force for releasing the brake using the same solenoid as is used for supplying the holding force.
- the rotary solenoid can be replaced by a simpler arrangement.
- the limit stop 25 can be a tubular member through which the rod 10 passes but could equally well be a simple stop arranged at any suitable position where it can be contacted by the plate 17 . Movement of the plate 17 to its operative, jamming position can be assisted by one or more springs if desired.
- the above-described arrangement is particularly effective when used in a testing apparatus where an electromagnetic ram is positioned above the test sample location. It can be used in other arrangements such as when hydraulic rams are present as the brake will be effective to prevent sinking of the hydraulic ram.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Braking Arrangements (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Linear Motors (AREA)
Abstract
Description
Claims (7)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0616589.8 | 2006-08-21 | ||
GBGB0616589.8A GB0616589D0 (en) | 2006-08-21 | 2006-08-21 | Linear motor brake |
GBGB0618209.1A GB0618209D0 (en) | 2006-08-21 | 2006-09-15 | Linear motor brake |
GB0618209.1 | 2006-09-15 | ||
PCT/IB2007/002233 WO2008023227A2 (en) | 2006-08-21 | 2007-08-02 | Linear motor brake |
Publications (2)
Publication Number | Publication Date |
---|---|
US20100230217A1 US20100230217A1 (en) | 2010-09-16 |
US8602177B2 true US8602177B2 (en) | 2013-12-10 |
Family
ID=37081338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/376,749 Active 2029-10-28 US8602177B2 (en) | 2006-08-21 | 2007-08-02 | Linear motor brake |
Country Status (8)
Country | Link |
---|---|
US (1) | US8602177B2 (en) |
EP (1) | EP2054219B1 (en) |
JP (1) | JP5185270B2 (en) |
KR (1) | KR101426869B1 (en) |
CN (1) | CN101505952B (en) |
DE (1) | DE602007013913D1 (en) |
GB (2) | GB0616589D0 (en) |
WO (1) | WO2008023227A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140174240A1 (en) * | 2012-12-24 | 2014-06-26 | Delta Robot Automatic Co., Ltd. | Apparatus for driving a scara robot and driving method thereof |
US9270155B2 (en) | 2012-05-20 | 2016-02-23 | Mts Systems Corporation | Linear actuator assembly |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0804220D0 (en) * | 2008-03-06 | 2008-04-16 | Itw Ltd | Bi-axial electromagnetic actuator |
GB2585471B (en) * | 2017-09-15 | 2021-07-21 | Illinois Tool Works | Braking system for electromagnetic motors |
GB2585470B (en) * | 2017-09-15 | 2021-07-21 | Illinois Tool Works | Braking system for electromagnetic motors |
GB2585473B (en) * | 2017-09-15 | 2021-07-21 | Illinois Tool Works | Braking system for electromagnetic motors |
GB2566497B (en) * | 2017-09-15 | 2020-07-29 | Illinois Tool Works | Braking system for electromagnetic motors |
CN109372909A (en) * | 2018-04-08 | 2019-02-22 | 九江精密测试技术研究所 | Mechanical locking device based on lever fine motion principle rotating shaft |
Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1107530A (en) | 1965-12-24 | 1968-03-27 | Electrotechnique De Boulogne B | Combined induction motor and brake unit |
US4214795A (en) * | 1977-11-25 | 1980-07-29 | Shoketsu Kinzoku Kogyo Kabushiki Kaisha | Piston braking device for hydraulic or pneumatic cylinders |
US4268093A (en) * | 1979-07-13 | 1981-05-19 | Mueller Zdenek | Air brake safety mechanism |
US4499977A (en) * | 1982-08-25 | 1985-02-19 | Girlock Limited | Integral park brake mechanism |
JPS62203042A (en) | 1986-03-01 | 1987-09-07 | Shimadzu Corp | Material tester |
US4798269A (en) | 1986-08-06 | 1989-01-17 | Pt Components, Inc. | Direct lever acting solenoid released brake mechanism |
US4938319A (en) * | 1987-11-14 | 1990-07-03 | Ernst Hans Hellmut | Linearly adjustable force transfer element with stepless inertia-sensitive blocking |
JPH03121725A (en) | 1989-10-05 | 1991-05-23 | Mitsubishi Electric Corp | Machining fluid supply device for electrical discharge machine |
JPH0441813A (en) | 1990-06-06 | 1992-02-12 | Fujita Corp | Construction method for removable anchors |
US5108066A (en) * | 1990-04-13 | 1992-04-28 | Lundstrom Donald A | Hand releasable locking collar |
EP0753670A1 (en) | 1995-01-31 | 1997-01-15 | Pubot Giken Co., Ltd. | Brake system for linearly movable bodies |
JPH11347873A (en) | 1998-06-02 | 1999-12-21 | Hitachi Via Mechanics Ltd | Work machining device |
US6009981A (en) * | 1996-09-17 | 2000-01-04 | Wolfe; William V. | Shaft locking or braking device for linear motion systems |
US6176639B1 (en) * | 1997-11-08 | 2001-01-23 | Numatics Gmbh | Fixing device |
US6435494B2 (en) * | 1999-12-08 | 2002-08-20 | Smc Kabushiki Kaisha | Clamp apparatus |
US20020112929A1 (en) * | 1995-10-06 | 2002-08-22 | Koshak John W. | Hydraulic elevator safety brake |
US6446769B1 (en) | 2000-10-02 | 2002-09-10 | Gregory A. Kangiser | Braking apparatus for a linear motor driven load |
JP2005291398A (en) | 2004-03-31 | 2005-10-20 | Tesuko Kk | Off-brake mechanism and exercise device using the same |
US20060213729A1 (en) * | 2003-12-29 | 2006-09-28 | Jelley Frederick A | Gain stabilizing self-energized brake mechanism |
JP4041813B2 (en) | 2004-01-15 | 2008-02-06 | 三木プーリ株式会社 | Brake device for shaft type linear motor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4273476B2 (en) * | 2000-02-18 | 2009-06-03 | Smc株式会社 | Linear actuator |
JP3121725U (en) * | 2006-03-06 | 2006-05-25 | テスコ株式会社 | Linear stage device |
-
2006
- 2006-08-21 GB GBGB0616589.8A patent/GB0616589D0/en active Pending
- 2006-09-15 GB GBGB0618209.1A patent/GB0618209D0/en active Pending
-
2007
- 2007-08-02 DE DE602007013913T patent/DE602007013913D1/en active Active
- 2007-08-02 JP JP2009525118A patent/JP5185270B2/en active Active
- 2007-08-02 US US12/376,749 patent/US8602177B2/en active Active
- 2007-08-02 KR KR1020097003394A patent/KR101426869B1/en not_active Expired - Fee Related
- 2007-08-02 EP EP07804698A patent/EP2054219B1/en active Active
- 2007-08-02 WO PCT/IB2007/002233 patent/WO2008023227A2/en active Application Filing
- 2007-08-02 CN CN2007800309278A patent/CN101505952B/en active Active
Patent Citations (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1107530A (en) | 1965-12-24 | 1968-03-27 | Electrotechnique De Boulogne B | Combined induction motor and brake unit |
US4214795A (en) * | 1977-11-25 | 1980-07-29 | Shoketsu Kinzoku Kogyo Kabushiki Kaisha | Piston braking device for hydraulic or pneumatic cylinders |
US4268093A (en) * | 1979-07-13 | 1981-05-19 | Mueller Zdenek | Air brake safety mechanism |
US4499977A (en) * | 1982-08-25 | 1985-02-19 | Girlock Limited | Integral park brake mechanism |
JPS62203042A (en) | 1986-03-01 | 1987-09-07 | Shimadzu Corp | Material tester |
US4798269A (en) | 1986-08-06 | 1989-01-17 | Pt Components, Inc. | Direct lever acting solenoid released brake mechanism |
US4938319A (en) * | 1987-11-14 | 1990-07-03 | Ernst Hans Hellmut | Linearly adjustable force transfer element with stepless inertia-sensitive blocking |
JPH03121725A (en) | 1989-10-05 | 1991-05-23 | Mitsubishi Electric Corp | Machining fluid supply device for electrical discharge machine |
US5108066A (en) * | 1990-04-13 | 1992-04-28 | Lundstrom Donald A | Hand releasable locking collar |
JPH0441813A (en) | 1990-06-06 | 1992-02-12 | Fujita Corp | Construction method for removable anchors |
EP0753670A1 (en) | 1995-01-31 | 1997-01-15 | Pubot Giken Co., Ltd. | Brake system for linearly movable bodies |
US5823300A (en) * | 1995-01-31 | 1998-10-20 | Pubot Giken Co., Ltd. | Brake device of linear moving body |
EP0753670B1 (en) | 1995-01-31 | 2000-11-02 | Pubot Giken Co., Ltd. | Brake system for linearly movable bodies |
US20020112929A1 (en) * | 1995-10-06 | 2002-08-22 | Koshak John W. | Hydraulic elevator safety brake |
US6009981A (en) * | 1996-09-17 | 2000-01-04 | Wolfe; William V. | Shaft locking or braking device for linear motion systems |
US6176639B1 (en) * | 1997-11-08 | 2001-01-23 | Numatics Gmbh | Fixing device |
JPH11347873A (en) | 1998-06-02 | 1999-12-21 | Hitachi Via Mechanics Ltd | Work machining device |
US6435494B2 (en) * | 1999-12-08 | 2002-08-20 | Smc Kabushiki Kaisha | Clamp apparatus |
US6446769B1 (en) | 2000-10-02 | 2002-09-10 | Gregory A. Kangiser | Braking apparatus for a linear motor driven load |
US20060213729A1 (en) * | 2003-12-29 | 2006-09-28 | Jelley Frederick A | Gain stabilizing self-energized brake mechanism |
JP4041813B2 (en) | 2004-01-15 | 2008-02-06 | 三木プーリ株式会社 | Brake device for shaft type linear motor |
JP2005291398A (en) | 2004-03-31 | 2005-10-20 | Tesuko Kk | Off-brake mechanism and exercise device using the same |
Non-Patent Citations (4)
Title |
---|
International Publication No. WO 2008/023227 A2. |
International Publication No. WO 2008/023227 A3. |
Search Report issued in GB Application No. GB0618209.1 on Dec. 22, 2006. |
Written Opinion of the International Search Authority. |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9270155B2 (en) | 2012-05-20 | 2016-02-23 | Mts Systems Corporation | Linear actuator assembly |
US20140174240A1 (en) * | 2012-12-24 | 2014-06-26 | Delta Robot Automatic Co., Ltd. | Apparatus for driving a scara robot and driving method thereof |
US9399288B2 (en) * | 2012-12-24 | 2016-07-26 | Delta Electronics, Inc. | Apparatus for driving scara robot |
Also Published As
Publication number | Publication date |
---|---|
KR20090042264A (en) | 2009-04-29 |
CN101505952A (en) | 2009-08-12 |
DE602007013913D1 (en) | 2011-05-26 |
US20100230217A1 (en) | 2010-09-16 |
KR101426869B1 (en) | 2014-08-05 |
JP2010502164A (en) | 2010-01-21 |
EP2054219B1 (en) | 2011-04-13 |
CN101505952B (en) | 2012-07-18 |
JP5185270B2 (en) | 2013-04-17 |
GB0618209D0 (en) | 2006-10-25 |
EP2054219A2 (en) | 2009-05-06 |
GB0616589D0 (en) | 2006-09-27 |
WO2008023227A3 (en) | 2008-06-26 |
WO2008023227A2 (en) | 2008-02-28 |
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Legal Events
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AS | Assignment |
Owner name: ILLINOIS TOOL WORKS INC., ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MEAD, GRAHAM;REEL/FRAME:024384/0950 Effective date: 20100503 |
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STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
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Year of fee payment: 4 |
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Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 8 |
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